Paper and Boards Flashcards
what is scoring?
Scoring is the same as cutting but the blade doesn’t go all the way through as less pressure is applied
How is paper and board commercially cut?
by using a die cutter
How does a die cutter work?
uses CAD drawing and laser cutting to make nets
what is creasing?
what happens to the cellulose fibres?
Creasing creates a permanent line after the material has been creased or folded as the cellulose fibres have become weakened
what is folding?
creating a shape [envelope]
What qualities make paper good for printing? [6]
- whiteness [brightness to allow double sided printing]
- opacity
- strength [resistance to tearing]
- absorbency [for water or ink]
- finish [satin, matt or gloss]
- cost [match a price point]
what 5 qualities can be altered to get perfect paper?
- cellulose fibres
- filers that smooth the paper
- sizing agents that increase absorbency
- calendaring process that makes correct thickness
- additional finishes like UV or texture
What does the Elmendorf test do?
tests the tear resistance of paper via a pendulum
calculates how much force is needed to continue a tear in the sample
what are 2 impact forces for paper and boards?
- package being damaged via transportation
- implements on the surface such as pens and rubbers
what is the structure of corrugated card?
to flat outers with a corrugated medium
Why is corrugated card good for packaging?
- good strength to weight ratio
- rigid
- shock absorbing
- good thermal insulation
- lightweight
why is tracing paper good for its purpose?
- semi translucent
- grey colour
- strong
- grease resistant [due to acid treatment]
what are the properties of layout paper for sketchpads?
- more opacity than tracing paper
- off white colour
- not as strong as tracing paper
- takes pencil well
how is bleed proof paper adapted for hand drawn rendering?
- no ink or solvent pens can bleed through
- highly sized [stops getting wet] and high opacity to give deeper colours
why is cartridge paper used for sketching?
- off white colour
- slightly textured
- takes drawing mediums well
why is water colour paper good for this style of painting?
- highly absorbent [little to no sizing]
- withstand large amounts of water and retain its structure
- matte and slightly textured finish
what are the 3 types are photo paper?
Inkjet paper, laser paper and photographic paper
what are the properties of inkjet paper?
- non-porous
- treated surface for a sharp image
what are the surface property of laser paper?
The plastic particles in the toner melt and bond to the surface
what are the properties of photographic paper?
- Photosensitive coating
- reacts to light
- image develops over time
why is bleached card good for high-end packaging and cards?
- highly brightened
- treated on both sides
- holds print well
- luxury feel
why is mount board good for mounting photos before framing?
- strong structure
- available in different colours
- good for making final models
- too expensive for prototypes
why is duplex board good for packaging?
- food safe [water and oil resistant]
- range of colours
- folds, cuts and prints well
why is foil lined and laminated card good for food packaging?
- impermeable layer for bacteria, light, air
- polyethylene is a food safe liner
what is the structure of Tetra-pak?
- 6 layers
- paper board [74%]
- polyethylene [22%]
- aluminum foil [4%]
what are the properties of Tetra-pak?
- good for storing liquids
- foil layer insulates
- contents remain sterile
- specialized recycling needed
why is metal effect card good for gift packaging?
- bright metallic effect
- embossing gives texture
- matte and shiny tones create patterns
- laminated versions are used for cake boards
what is moulded paper pulp?
- 100% recyclable ecofriendly packaging
- limited printability
